Revision 229343

MFC r210993, r228356:

r210933 (joel):
 - Fix typos and spelling mistakes

r228356: [3]
 - Update du(1):
   - Sort arguments alphabetically where appropriate
   - '-B blocksize' is not mutually exclusive of '-h|-k|-m'
   - Mention '-t' in synopsis
   - Other wording improvements
   - Update usage() output to reflect the new synopsis
   - Other miscellaneous improvements

PR:             162438 [3]